Burr for dressing pulp grindstones



Dec. 3, 1929. w, AlKlN 1,737,551

BURR FOR DRESSING PULP GRINDSTONES Filed Oct. 22. 1925 fnueni'or:

Rank WAI'Itin,

Patented Dec. 3, 1929 PATENT OFFICE FRANK W. AIKIN, OF WATERTOWN, NEW YORK BUB/R FOR DRESSING PULP GRINDSTONES Application filed October 22, 1925.

My invention relates to burrs for dressing grindstones employed in the manufacture of wood pulp and consists in the features hereinafter described and particularly pointed 5 out in the claims.

In the particular exemplification of the invention shown in the accompanying drawings:

Figure 1 is a side elevation of the burr.

Fig. 2 is a transverse sectional View.

As shown in the accompanying drawings, the burr is characterized by two circumferentially arranged zones of teeth the teeth in one zone being of a different character from those of the contiguous zone or zones, and the set of teeth of one zone being arranged in advance of the teeth of the contiguous set in a direction axially of the burr.

As shown in Fig. 1, the burr comprises: two

sections only. One of these sections 1 has a peripheral surface presenting the conventional diamond burr pattern, or pattern of teeth for dressing the peripheral surface of the grindstone.

Section 2 is shown wider than section 1, is of the same internal diameter and its peripheral surface is formed to present the conventional thin tooth spiral cut pattern for scoring the surface of the grindstone around 0 its periphery in the manner well known in this industry.

As shown, the teeth of section 2 are considerably deeper, or longer in a vertical direction, than the teeth of section 1, and the length of a diametrical line intersecting the apices of the teeth of section 2 is somewhat longer than a corresponding line intersecting the apices of the teeth of section 1.

In this form of the invention the teeth of 0 one section are used for scoring the surface of the stone and the teeth of the other section for dressing the surface between the scorings.

The zone in which is located the set of teeth employed for dressing the surface of the stone nay be arranged in advance of, or to the rear or, the zone in which is located the teeth used for scoring the surface of the stone, and the teeth of each set may be formed in an indivi dual band, or ring, or they may be both out in a single band, or barrel.

Serial No. 64,207.

It will be understood that the usual appliances are employed for holding the burr in contact with the stone, and for feeding it from side to side thereof during the jigging operation.

The relative arrangement or disposition of the two sets of teeth insures that the dressing set of teeth will engage the stone with the requisite lightness when the scoring teeth are so set as to penetrate the stone to the desired depth.

I claim:

1. A composite burr for dressing pulpwood grindstones comprising two sections combined for simultaneous rotary and simultaneous traversing movement from side to side of the stone, the teeth of one section having edges for scoring the stone and the teeth of the other section being of dissimilar character for dressing the stone surface, one of said sections following the other as the burr is moved from side to side of the stone, both of said sections being cylindrical, and one of said sections having its toothed surface of less diameter than that of the other section, substantially as described.

2. A composite burr for dressing woodpulp grindstones comprising a section having diamond teeth, and a section having teeth to score the stone, said sections being side by side and coaxial, the diamond toothed section being somewhat less in total diameter than the other, substantially as described.

In testimony whereof, I anix my signature.

FRANK W. AIKIN. 

